java 记事本

课程设计课程设计名称：专业班级：学生姓名：学号：指导教师：课程设计时间：记事本一、需求分析使用java GUI实现一个记事本程序，实现文本的输入、修改、选择、存储、加载和文字样式的修改。

实现一个窗体程序，得用到我们学过的轻量级组件，然后再窗体里实现对文件的打开、新建、保存、另存为；实现对文本复制，粘贴，剪切，替换，添加日期/时间;为文字提供自动换行、字体。

其中文本替换实现区分大小写替换，为方便实现需要在建立一个窗体；字体提供用户字形、字体、大小变换。

二、概要设计三、运行环境、开发语言开发环境：JDK1.6 记事本主窗文件编辑格式新建打开保存另存复制粘贴剪切时间换行字体替换窗体字体窗体替换文本框开发语言：java语言四、详细设计1 程序清单表1 程序清单文件名功能MainFrame.java 记事本主窗口PFont.java 字体选项窗口Repalce.java 文本替换窗口2 主要代码2.1 文件打开保存文件的打开保存会根据用户是否修改过文本和是否指定存取文件路径开操作。

通过设置一个全局变量String content=“”;来存放文件刚打开时的文本，然后通过比较content和文本区里面的文本内容来提示用户是否保存！if (!content.equals(text.getText())) {//判断文件是否修改，如果修改就保存，没有修改不做操作int value = JOptionPane.showConfirmDialog(jf, "是否保存修改的文件","提醒", JOptionPane.YES_NO_OPTION);if (value == JOptionPane.YES_OPTION) {try {saveFile();} catch (IOException e1) {// TODO Auto-generated catch blockJOptionPane.showMessageDialog(jf, "保存失败" + e1);}}}通过设置一个全局变量File file=null；来记录用户是否指定文件的存取位置，如果用户没有指定，则调用文件选择框让用户选择存取文件。

if (file == null) { //判断文件是否为空，为空则让用户指定！chooser.showSaveDialog(jf);file = chooser.getSelectedFile();}try {saveFile();} catch (IOException e1) {JOptionPane.showMessageDialog(jf, "保存失败" + e1);}文件操作菜单的截图2.2 文本的复制粘贴剪切，替换，增加日期/时间文本的复制粘贴剪切调用的是JTextArea里的方法完成。

//为剪切注册监听器itCut.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {text.cut();}});//为复制注册监听器itCopy.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e) {text.copy();}});//为粘贴注册监听器itPaste.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {text.paste();}});文本的替换实现的是整个文本的文字替换，利用正则表达式来实现区分大小写替换。

char[] ch=sfie1.toCharArray();for(int i=0;i<ch.length;i++){st+="["+Character.toLowerCase(ch[i])+Character.toUpperCase(ch[i])+"]";//正则表达式的实现}String str1=str.replaceAll(sfie1, sfie2);替换窗口增加日期/时间是在文本区最后追加日期时间。

利用SimpleDateFormat和Date类实现SimpleDateFormat time=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");text.append(time.format(new Date()));2.3 自动换行和字体自动换行调用JTextArea类里的方法实现。

tAutoLine.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {if(itAutoLine.isSelected())text.setLineWrap(true); //调用JTextArea方法elsetext.setLineWrap(false);}});字体窗口利用JList类让用户选着字形、字体、大小，然后把用户所选的字体信息封装到Font对象里，利用ATextArea里的setFont方法改变文字字体信息。

JButton fontOk= new JButton("确定");fontOk.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {int fontStyleConst[] = { Font.PLAIN, Font.BOLD, Font.ITALIC, Font.BOLD + Font.ITALIC };Font tempFont = new Font(tfFont.getText(),fontStyleConst[listStyle.getSelectedIndex()],Integer.parseInt(tfSize.getText()));//封装用户选着的字体信息到Font里面，并设置到文本区text.setFont(tempFont);//jf.dispose();}});字体窗口截图五、调试与分析在进行调试编写程序的时候遇到了标志字段的问题，什么时候该加final，什么时候该加static，总是程序报错的时候才发现问题，后来在程序错误的提醒来，一步步完成标志字段的问题。

在程序逻辑问题上主要是文本区里的内容是否被修改，是否该提醒用户保存，后来用了个全局变量来存放原始的文本，通过比较这个变量跟文本区里的文本来判断是否提醒用户保存。

六、功能测试文本已被修改，提醒用户保存。

文本替换，提供区分大小写替换前替换后字体修改修改前修改后七、结论与心得遇到了很多不知道的方法和类，通过查API和上网搜索解决了问题。

我学到了窗口怎能弹对话框，怎么弹文件选择框，刚开始不怎么会用这些类，后来查查API和翻书就略懂了。

我觉得我写的这个记事本要是能实现查找，改变字体和背景颜色，提供状态栏就好了，可惜时间和技术有限！八、参考资料[1] Java程序设计与实验，刘继承，清华大学出版社，2012[2] [3] Java TM Platform Standard Edition 6 的 API源代码：MainFrame.javaimport java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.BufferedReader;import java.io.File;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;import javax.swing.JCheckBoxMenuItem;import javax.swing.JFileChooser;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JOptionPane;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.filechooser.FileNameExtensionFilter;public class MainFrame {static String content="";JTextArea text;JFileChooser chooser;File file = null;final JFrame jf;MainFrame() {// JOptionPane dialog=new JOPtionPane();jf = new JFrame();JMenuBar bar = new JMenuBar();jf.setSize(600, 400);JMenu mFile = new JMenu(" 文件 ");JMenu mEdit = new JMenu(" 编辑 ");JMenu mForm = new JMenu(" 格式 ");JMenuItem itCreat = new JMenuItem("新建");JMenuItem itOpen = new JMenuItem("打开");JMenuItem itSave = new JMenuItem("保存");JMenuItem itOSave = new JMenuItem("另存为");JMenuItem itExit = new JMenuItem("退出");JMenuItem itCopy = new JMenuItem("复制");JMenuItem itPaste = new JMenuItem("粘贴");JMenuItem itCut = new JMenuItem("剪切");JMenuItem itRepalce = new JMenuItem("替换");JMenuItem itadd = new JMenuItem("日期/时间");final JCheckBoxMenuItem itAutoLine = new JCheckBoxMenuItem("自动换行");JMenuItem itFont = new JMenuItem("字体");mFile.add(itCreat);mFile.add(itOpen);mFile.add(itSave);mFile.add(itOSave);mFile.add(itExit);mEdit.add(itCopy);mEdit.add(itPaste);mEdit.add(itCut);mEdit.add(itRepalce);mEdit.add(itadd);mForm.add(itAutoLine);mForm.add(itFont);bar.add(mFile);bar.add(mEdit);bar.add(mForm);jf.setJMenuBar(bar);jf.setVisible(true);text = new JTextArea(1, 2);jf.add(new JScrollPane(text));// 变量初始化content = new String("");chooser = new JFileChooser(".");FileNameExtensionFilter filter = new FileNameExtensionFilter(null,"txt");chooser.addChoosableFileFilter(filter);// 注册监听器// 给创建注册监听器itCreat.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {if (!content.equals(text.getText())) {int value = JOptionPane.showConfirmDialog(jf, "是否保存修改的文件","提醒", JOptionPane.YES_NO_OPTION);if (value == JOptionPane.YES_OPTION) {try {saveFile();} catch (IOException e1) {// TODO Auto-generated catch blockJOptionPane.showMessageDialog(jf, "保存失败 " + e1);}}}text.setText("");jf.setTitle("新建文本");file = null;}});// 给打开注册事件监听器itOpen.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {if (!content.equals(text.getText())) {int value = JOptionPane.showConfirmDialog(jf, "是否保存修改的文件","提醒", JOptionPane.YES_NO_OPTION);if (value == JOptionPane.YES_OPTION) {try {saveFile();} catch (IOException e1) {// TODO Auto-generated catch blockJOptionPane.showMessageDialog(jf, "保存失败 " + e1);}}}chooser.showOpenDialog(jf);file = chooser.getSelectedFile();if (file == null) {JOptionPane.showMessageDialog(jf, "没有选择文件");return;}try {getTextFromFile();} catch (IOException e1) {// TODO Auto-generated catch blockJOptionPane.showMessageDialog(jf, "打开失败 " + e1);}}});// 给保存注册事件监听器itSave.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {if (file == null) {chooser.showSaveDialog(jf);file = chooser.getSelectedFile();}try {saveFile();} catch (IOException e1) {JOptionPane.showMessageDialog(jf, "保存失败 " + e1);}jf.setTitle(file.getName());}});//另存为注册监听事件itOSave.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {chooser.showDialog(jf, "另存为");file=chooser.getSelectedFile();try {saveFile();} catch (IOException e1) {JOptionPane.showMessageDialog(jf, "保存失败 " + e1);}}});//itExit.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {if (!content.equals(text.getText())) {int value = JOptionPane.showConfirmDialog(jf, "是否保存修改的文件","提醒", JOptionPane.YES_NO_OPTION);if (value == JOptionPane.YES_OPTION) {try {saveFile();} catch (IOException e1) {// TODO Auto-generated catch blockJOptionPane.showMessageDialog(jf, "保存失败 " + e1);}}}System.exit(0);}});//为剪切注册监听器itCut.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {text.cut();}});//为复制注册监听器itCopy.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e) {text.copy();}});//为粘贴注册监听器itPaste.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {text.paste();}});//为替换注册监听器itRepalce.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {new Repalce(text);}});//为时间/日期注册监听器itadd.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {SimpleDateFormat time=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");text.append(time.format(new Date()));}});//为自动换行注册监听器itAutoLine.addActionListener(new ActionListener(){@Overridepublic void actionPerformed(ActionEvent e) {if(itAutoLine.isSelected())text.setLineWrap(true);elsetext.setLineWrap(false);}});//为字体注册监听器itFont.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {new PFont(text);}});//默认退出jf.addWindowListener(new WindowAdapter() {@Overridepublic void windowClosing(WindowEvent e) {// TODO Auto-generated method stubif (!content.equals(text.getText())) {int value = JOptionPane.showConfirmDialog(jf, "是否保存修改的文件","提醒", JOptionPane.YES_NO_OPTION);if (value == JOptionPane.YES_OPTION) {try {saveFile();} catch (IOException e1) {// TODO Auto-generated catch blockJOptionPane.showMessageDialog(jf, "保存失败 " + e1);}}}System.exit(0);}});}/*** 将file指向的文件写入文本区** @throws IOException*/public void getTextFromFile() throws IOException {content = "";String line = "";BufferedReader reader = new BufferedReader(new FileReader(file));while ((line = reader.readLine()) != null) {content += line + "\r\n";}text.setText(content);reader.close();}/*** 将文本区的内容保存到file指向的文件** @throws IOException*/public void saveFile() throws IOException {if (file == null) {chooser.showSaveDialog(jf);file = chooser.getSelectedFile();}content = text.getText();FileWriter out = new FileWriter(file);out.write(content);out.close();}public static void main(String[] args) {new MainFrame();}}PFont.javaimport java.awt.Dimension;import java.awt.Font;import java.awt.GraphicsEnvironment;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JList;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.ListSelectionModel;import javax.swing.event.ListSelectionEvent;import javax.swing.event.ListSelectionListener;public class PFont {JFrame jf;JPanel pane1, pane2, pane3, pane4;JTextField tfFont, tfSize, tfStyle;JList listStyle, listFont, listSize;PFont(final JTextArea text) {jf = new JFrame("字体设置");pane1 = new JPanel();pane2 = new JPanel();pane3 = new JPanel();pane4 = new JPanel();Font currentFont = text.getFont();JLabel lbFont = new JLabel("字体");JLabel lbStyle = new JLabel("字形");JLabel lbSize = new JLabel("大小");lbFont.setPreferredSize(new Dimension(91, 20));lbStyle.setPreferredSize(new Dimension(82, 20));lbSize.setPreferredSize(new Dimension(100, 20));//默认字体tfFont = new JTextField(13);tfFont.setText(currentFont.getFontName());tfFont.setPreferredSize(new Dimension(200, 20));//默认字形tfStyle = new JTextField(10);if (currentFont.getStyle() == Font.PLAIN)tfStyle.setText("常规");else if (currentFont.getStyle() == Font.BOLD)tfStyle.setText("粗体");else if (currentFont.getStyle() == Font.ITALIC)tfStyle.setText("斜体");else if (currentFont.getStyle() == (Font.BOLD + Font.ITALIC)) tfStyle.setText("粗斜体");tfStyle.setPreferredSize(new Dimension(200, 20));//默认大小tfSize = new JTextField(7);tfSize.setText(currentFont.getSize() + "");tfSize.setPreferredSize(new Dimension(200, 20));//字形final String fontStyle[] = { "常规", "粗体", "斜体", "粗斜体" };listStyle = new JList(fontStyle);listStyle.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);if (currentFont.getStyle() == Font.PLAIN)listStyle.setSelectedIndex(0);else if (currentFont.getStyle() == Font.BOLD)listStyle.setSelectedIndex(1);else if (currentFont.getStyle() == Font.ITALIC)listStyle.setSelectedIndex(2);else if (currentFont.getStyle() == (Font.BOLD + Font.ITALIC)) listStyle.setSelectedIndex(3);listStyle.setVisibleRowCount(7);listStyle.setFixedCellWidth(85);listStyle.setFixedCellHeight(20);listStyle.addListSelectionListener(new ListSelectionListener() {public void valueChanged(ListSelectionEvent event) {tfStyle.setText(fontStyle[listStyle.getSelectedIndex()]);}});//字体GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();final String fontName[] = ge.getAvailableFontFamilyNames();int defaultFontIndex = 0;for (int i = 0; i < fontName.length; i++) {if (fontName[i].equals(currentFont.getFontName())) {defaultFontIndex = i;break;}}listFont = new JList(fontName);listFont.setSelectedIndex(defaultFontIndex);listFont.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);listFont.setVisibleRowCount(7);listFont.setFixedCellWidth(99);listFont.setFixedCellHeight(20);listFont.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent event) {tfFont.setText(fontName[listFont.getSelectedIndex()]);}});//字体大小final String fontSize[] = { "8", "9", "10", "11", "12", "14", "16", "18", "20", "22", "24", "26", "28", "36", "48", "72" };listSize = new JList(fontSize);int defaultFontSizeIndex = 0;for (int i = 0; i < fontSize.length; i++) {if (fontSize[i].equals(currentFont.getSize() + "")) {defaultFontSizeIndex = i;break;}}listSize.setSelectedIndex(defaultFontSizeIndex);listSize.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);listSize.setVisibleRowCount(7);listSize.setFixedCellWidth(50);listSize.setFixedCellHeight(20);listSize.addListSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent event) {tfSize.setText(fontSize[listSize.getSelectedIndex()]);}});//按钮JButton fontOk= new JButton("确定");fontOk.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {int fontStyleConst[] = { Font.PLAIN, Font.BOLD, Font.ITALIC, Font.BOLD + Font.ITALIC };Font tempFont = new Font(tfFont.getText(), fontStyleConst[listStyle.getSelectedIndex()],Integer.parseInt(tfSize.getText()));text.setFont(tempFont);//jf.dispose();}});JButton cancel = new JButton("取消");cancel.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {jf.dispose();}});//添加pane1.add(lbFont);pane1.add(lbStyle);pane1.add(lbSize);pane2.add(tfFont);pane2.add(tfStyle);pane2.add(tfSize);pane3.add(new JScrollPane(listFont));pane3.add(new JScrollPane(listStyle));pane3.add(new JScrollPane(listSize));pane4.add(fontOk);pane4.add(cancel);jf.setLayout(new GridLayout(4,1));jf.add(pane1);jf.add(pane2);jf.add(pane3);jf.add(pane4);jf.setSize(400, 600);jf.setLocation(200, 200);//jf.setResizable(false);jf.setVisible(true);}public static void main(String[] args) {// TODO Auto-generated method stub}}Repalce.javaimport java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JRadioButton;import javax.swing.JTextArea;import javax.swing.JTextField;public class Repalce {boolean boo = false;JTextArea area;JTextField fie;JTextField fie1;Repalce(final JTextArea area) {this.area=area;JFrame jf = new JFrame();jf.setVisible(true);jf.setSize(400, 200);jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);fie = new JTextField(15);fie1 = new JTextField(15);JButton jb = new JButton("全部替换");JLabel jl = new JLabel("查找内容:");JLabel jl1 = new JLabel("替换为:");JRadioButton jr = new JRadioButton("区分大小写");JPanel jp = new JPanel();jp.setLayout(new GridLayout(3, 2));JPanel jp0 = new JPanel();jp0.add(jl);jp.add(jp0);JPanel jp01 = new JPanel();jp01.add(fie);jp.add(jp01);JPanel jp1 = new JPanel();jp1.add(jl1);jp.add(jp1);JPanel jp11 = new JPanel();jp11.add(fie1);jp.add(jp11);JPanel jpr = new JPanel();jpr.add(jr);jp.add(jpr);JPanel jp2 = new JPanel();jp2.add(jb);jp.add(jp2);jf.add(jp);jr.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {boo = (boo == true) ? false : true;System.out.println(boo);}});jb.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {String str=tihuan();area.setText(str);}});}protected String tihuan() {// TODO Auto-generated method stubString str,sfie1,sfie2;str=area.getText();sfie1=fie.getText().toLowerCase();sfie2=fie1.getText();if(boo==false){String st="";char[] ch=sfie1.toCharArray();for(int i=0;i<ch.length;i++){st+="["+Character.toLowerCase(ch[i])+Character.toUpperCase(ch[i]) +"]";}sfie1=st;}String str1=str.replaceAll(sfie1, sfie2);System.out.println(sfie1+" "+sfie2+"\r\n"+str1);return str1;}}。